Fatigue Testing Begun

This is the first test fixture.  Version 2.0 is already under way

This is the first test fixture. Version 2.0 is already under way

I can’t keep up with all that’s happening.

On Tuesday—a lifetime ago—we started our fatigue testing program.  In fact, the tester is running as I type.

The tester had been running 24-hours per day since Tuesday.

Testing Ad Infinitum

We’re trying to set the benchmark failure point at about 75,000 cycles.  I’ll post more about this later.  The reason I mention it here is that 75,000 cycles takes about 21 hours to reach.  So, at best, we’ll be running one test per day.  And, we have about 100 tests we want to run for the Collaborative.  So, we’re looking at about a 20-week testing schedule—100 tests divided over a 5-day work week.  20-weeks we don’t have for the Colab.  So, we’re now in negotiations regarding which tests take priority and which tests will have to wait for Colab 2.0—or some other project.


We’ve had a few hiccups in getting the equipment going; regardless, we’re running now and we’ve already had some interesting results—not so much for lug testing but for patience testing.  Here are some of the challenges we had before I thought we’d be testing last week.

  • Our testing equipment also has other testing commitments so we’re trying to schedule four heavy duty testing projects all at once
  • Our testing computer died so we had to get that going again
  • Skip—Seven’s tool maker, head machinist, and just about everything else—had some other projects and commitments to deal with before wrapping up the test fixture
  • We had an internal miscommunication about joint geometry that required a fixture change—this turned into a great Colab learning moment

We’re going to start posting results soon and catalogue them here for posterity.  And, we’re making some changes to the fixture that will minimize more possible variables.

Stay tuned.

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